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우승균 ( Seung Gyun Woo ),이소연 ( So Yeon Lee ),최고운 ( Go Woon Choi ),홍유진 ( You Jin Hong ),이소민 ( So Min Lee ),박강균 ( Kang Gyun Park ),엄용빈 ( Yong Bin Eom ) 대한임상검사과학회 2015 대한임상검사과학회지(KJCLS) Vol.47 No.4
Equol has beneficial effects on human health. Fermented soy products contain equol, and many microbes participate in the equol production process. This study investigated fermented Korean soybean paste, doenjang. Thirty seven doenjang samples collected from different manufacturers were examined. Equol was detected in 3 samples (D2, D13, and D19) at the maximum content of 507 ng/100 g by liquid chromatography-tandem mass spectrometry (LC-MS/MS). Fifteen microbial species were isolated and identified by 16S rRNA gene sequence analysis and by matrix assisted laser desorption/ionization-time of flight mass spectrometry (MALDI-TOF MS). Bacillus spp, Paenibacillus spp, Tetragenococcus spp, Stapylococcus spp, and Clostridium species were the predominant bacteria in equol containing doenjang samples.